diff --git a/apps/web/src/app/vault/org-vault/vault.component.ts b/apps/web/src/app/vault/org-vault/vault.component.ts
index 1eea053d1f..a52530dde1 100644
--- a/apps/web/src/app/vault/org-vault/vault.component.ts
+++ b/apps/web/src/app/vault/org-vault/vault.component.ts
@@ -1249,6 +1249,8 @@ export class VaultComponent implements OnInit, OnDestroy {
         organizationId: this.organization?.id as OrganizationId,
         availableCollections,
         activeCollection: this.activeFilter?.selectedCollectionNode?.node,
+        isSingleCipherAdmin:
+          items.length === 1 && (this.organization?.canEditAllCiphers || items[0].isUnassigned),
       },
     });
 
diff --git a/libs/common/src/vault/abstractions/cipher.service.ts b/libs/common/src/vault/abstractions/cipher.service.ts
index 061bd5cedb..e82c07653c 100644
--- a/libs/common/src/vault/abstractions/cipher.service.ts
+++ b/libs/common/src/vault/abstractions/cipher.service.ts
@@ -113,6 +113,13 @@ export abstract class CipherService implements UserKeyRotationDataProvider<Ciphe
    * @returns A promise that resolves when the collections have been saved
    */
   saveCollectionsWithServer: (cipher: Cipher) => Promise<Cipher>;
+
+  /**
+   * Save the collections for a cipher with the server as an admin.
+   * Used for Unassigned ciphers or when the user only has admin access to the cipher (not assigned normally).
+   * @param cipher
+   */
+  saveCollectionsWithServerAdmin: (cipher: Cipher) => Promise<void>;
   /**
    * Bulk update collections for many ciphers with the server
    * @param orgId
diff --git a/libs/common/src/vault/services/cipher.service.ts b/libs/common/src/vault/services/cipher.service.ts
index 9761387284..a06ca4d793 100644
--- a/libs/common/src/vault/services/cipher.service.ts
+++ b/libs/common/src/vault/services/cipher.service.ts
@@ -858,6 +858,11 @@ export class CipherService implements CipherServiceAbstraction {
     return new Cipher(updated[cipher.id as CipherId], cipher.localData);
   }
 
+  async saveCollectionsWithServerAdmin(cipher: Cipher): Promise<void> {
+    const request = new CipherCollectionsRequest(cipher.collectionIds);
+    await this.apiService.putCipherCollectionsAdmin(cipher.id, request);
+  }
+
   /**
    * Bulk update collections for many ciphers with the server
    * @param orgId
diff --git a/libs/vault/src/components/assign-collections.component.ts b/libs/vault/src/components/assign-collections.component.ts
index db4d61691c..884a79bf1d 100644
--- a/libs/vault/src/components/assign-collections.component.ts
+++ b/libs/vault/src/components/assign-collections.component.ts
@@ -64,6 +64,15 @@ export interface CollectionAssignmentParams {
    * removed from the ciphers upon submission.
    */
   activeCollection?: CollectionView;
+
+  /**
+   * Flag indicating if the user is performing the action as an admin on a SINGLE cipher. When true,
+   * the `/admin` endpoint will be used to update the cipher's collections. Required when updating
+   * ciphers an Admin does not normally have access to or for Unassigned ciphers.
+   *
+   * The bulk method already handles admin actions internally.
+   */
+  isSingleCipherAdmin?: boolean;
 }
 
 export enum CollectionAssignmentResult {
@@ -463,6 +472,10 @@ export class AssignCollectionsComponent implements OnInit, OnDestroy, AfterViewI
     const { collections } = this.formGroup.getRawValue();
     cipherView.collectionIds = collections.map((i) => i.id as CollectionId);
     const cipher = await this.cipherService.encrypt(cipherView, this.activeUserId);
-    await this.cipherService.saveCollectionsWithServer(cipher);
+    if (this.params.isSingleCipherAdmin) {
+      await this.cipherService.saveCollectionsWithServerAdmin(cipher);
+    } else {
+      await this.cipherService.saveCollectionsWithServer(cipher);
+    }
   }
 }